Rain gauge



FIG. 1 is a perspective view of the “rain gauge,” showing my new design;

FIG. 2 is a top elevation view thereof;

FIG. 3 is a bottom elevation view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a back elevation view thereof; and,

FIG. 6 is a right-side elevation view thereof, the left-side view being a mirror image of that shown. 

The ornamental design for a “rain gauge,” as shown and described. 